update changelog for release

diff --git a/doc/news/9.4.1-vs-9.4.2.h b/doc/news/9.4.1-vs-9.4.2.h
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+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2017 - 2022 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE.md at
+// the top level directory of deal.II.
+//
+// ---------------------------------------------------------------------
+
+/**
+@page changes_between_9_4_1_and_9_4_2 Changes between Version 9.4.1 and 9.4.2
+
+<p>
+This is the list of changes made between the release of deal.II version
+9.4.1 and that of 9.4.2. All entries are signed with the names of the
+author.
+</p>
+
+<!-- ----------- SPECIFIC IMPROVEMENTS ----------------- -->
+
+<a name="specific"></a>
+<h3>Specific improvements</h3>
+<ol>
+
+ <li>
+  Fixed: Various compatiblity issues and minor bugfixes have been resolved:
+  <ol>
+  <li>A compilation issue with step-70 has been resolved</li>
+  <li>CMake: prefer <code>-pthread</code> for posix thread support</li>
+  <li>Fix a type mismatch for suitesparse that leads to compilation failures on certain platforms</li>
+  <li>A number of Microsoft Visual Code compatibility fixes concerning extern declarations</li>
+  </ol>
+  <br>
+  (Wolfgang Bangerth, David Wells, Matthias Maier, 2023/02/06)
+ </li>
+
+</ol>
+
+*/